To effectively reduce the interference noise in attracting an armature 5 to an end face of a rotor 4.

This electromagnetic clutch comprises a non-rotational exciting coil 2 axially movably mounted on a housing 1, a rotor 4 mounted in a state of surrounding the exciting coil 2, and rotatably held on an outer periphery of the housing 1, an armature 5 mounted close to and opposite to an end face of the rotor 4, a coupling 7 axially movably connecting the armature 5 to the rotating shaft 6, a permanent magnet 8 fixed to the housing 1 and opposite to the exciting coil 2 by the polarities different from each other from a side opposite to the armature 5, and an energizing means 9 for energizing the exciting coil 2 toward an armature 5 side. As the exciting coil 2 is displaced to a permanent magnet 8 side in being electrically energized, a distance to the armature can be kept, and the acceleration of the armature 5 in attraction process to the rotor 4 can be inhibited.